Improvement in cutting attachments for sewing-machines



I 4 v ZShe'ets S'I Ie et Z. v A. SPRINGER.

I Cutting Attachments fnr Sewing-Manning's} N0 .l58,8|3. Patentedlan.19,1875.

MUNITED STATES PATENT FFIGE.

WILLIAM A. SPRINGER, OF MARLBOROUGH, MASSACHUSETTS.

IMPROVEMENT IN CUTTING ATTACHMENTS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 158,813, dated January 19, 1875 application filed December 1,1874.

To all whom it may concern:

Be it known that I, WILLIAM A. SPRINGER, of Marlborough, in the county of Middlesex and (lommonwealth of Massachusetts, have invented certain new and useful Improvements in Trimming Attachments for Sewing-Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and in Which Figure 1 represents a side view of so much of a Howe sewing-machine, with my improvements applied thereto, as is necessary to illustrate the application of my-said improvements to this class of sewing-machines, the skill of the mechanic being sufficient to apply it to other styles of sewing-machines to which it is applicable; and Fig. 2 represents a side viewof my said improvements and parts of the machine shown in Fig; 1, for the purpose of showing more fully the trimming-cutter and its shaft in different positions, as will be hereafter explained.

To enable those skilled in the art to which my invention belongs to make and use the same, I will proceed to describe it more in detai In the drawings, the part marked A represents the table or bed of the machine; B and U, the goose-neck, which supports the front part D and the bearing for the vibrating arm E, which works the needle-rod F. G is the presser-foot; H, the rotating shaft, to which is secured the trimming-cutter a. The rear end of shaft H is provided with a circular and convex bearing, which turns in a corresponding concavity in a bearing-piece, I, which, in this instance, is made open on one side, and with two lips, through which a screw passes, whereby said bearing-piece I can be compressed about the convex bearing, secured to the rear end of the shaft H, sufficiently to 'retain shaft H from any longitudinal movement, while permitting its front end to rise and fall, as occasion may require in the operation of the trimmer. The convex bearingpiece secured-t0 the rear end of shaft H is, in this instance, an extension-of the hub of gear J, which meshes into a larger gear, K, secured on the main shaft of the sewing-machine, only a section of the gear being shown in the drawings. The part B is recessed or bored out to allow of the passage of shaft H through it, said recess being deep enough to allow the shaft to vibrate up and down into the position shown in full and dotted lines, Fig. 2. L is an arm, the upper end of which is secured to the neck 0, to which the upper end of bearing-piece M is also'secured, screw a holding it securely in position. 0 is a lever, rocking on pivot l in the lower end of arm L. The part M has two bearings, 3 3, in which the standard N works up and down to raise and lower the front end .of shaft H, whose bearing 1) has a tongue, which is pivoted at 4 in a slot in the lower end of standard N, so that bearing 1) can swing or vibrate when the front end of shaft H is raised and lowered, and thus prevent binding of said shaft H in its bearing 11. An adjustable piece, 0, is secured to the rod 1? by means of a set-screw, so that it can be adjusted up or down as oocasion may require. A lever, d, is pivoted at 6, so as to work in a slot in the front part of the piece 0, said lever being provided. with a thumb-piece, f. The upper end of said lever, when in the position shown in Fig. 1, holds the flattened end h of rocking lever 0 up against spring g, which is arranged upon the upper end of rod P, and is prevented from slipping from the end of said rod by means of a pin, 5. Rod P passes down through the bed of the machine, and is connected with an cecentric upon the main shaft, so as to give a rocking motion to lever O, the front end of which is connected by an arm, Q, to a hubpiece on standard N, and which hub-piece is secured to said standard by a screw, 2; con seqhently, it will be seen that, while shaft H is rotated, it will have an up-and-dovvn motion imparted to it, similar to the motion described in my previous patents for trimming attachments for sewing-machines, and upon which my present invention is an improvement. When it is desired to raise the front end of the shaft H and cutter a, for the purpose of turning corners or passing work over the table, the operator takes hold of projection f and pulls out the lower end of lever d, which throws the upper end of said lever forward from under the rear end h of lever 0, when spiral spring 9 forces down the rear end of said lever, thereby raising standard N, front end of shaft H, and cutter a, as indicated in dotted lines, Fig. 2. By returning lever d again to the position shown in Fig. 1, the work progresses as described in my former patents. It will be observed that, by adjustin g the piece 0 on rod P, and the hub on standard N, to which the arm Q is hinged, the front end of shaft H can be adj nsted to work at the desired elevation when it is depressed from trimming the work.

Having described my present improvements in trimming attachments for sewing-machines, What I claim therein as new and of my in vention, and desire to secure by Letters Patent, is

1. The combination, with rod P and standard N, of rocking lever O, substantially as and for the purposes set forth.

2. The combination, with lever O and rod P, of piece 0, lever d, and spring g, substantially as and for the purposes set forth.

3. The combination, with shaft H, rod P, standard N, and neck-piece G, of bearingpieces L and M, rocking lever O, hinged bearing 1), adjustable piece a, lever 01, and spring 9, substantially as and for the purposes set forth.

WILLIAM A. SPRINGER.

Witnesses S. N. ALDRICH, G. G. WHITNEY. 

